Safety-valve



(No Model.)

F. X. VIEN.

SAFETY VALVE.

No. 398,557. Patented Feb. 26, 1889.

IIVVENTOR:

ATTORNEYS;

UNITED STATES PATENT OFFICE.

FRANCIS XAVIER VIEN, OF BROOKLYN, NEW YORK.

SAFETY-VALVE.

SPECIFICATION forming part of Letters Patent No. 398,557, datedFebruary26, 1889.

Application filed November 8, 1888. Serial No. 290,28d (No model.)

To CLZZ whom, it may concern:

Be it known that I, FRANCIS XAVIER VIEN, of Brooklyn, in the county ofKings and State of New York, have invented a new and ImprovedSafety-Valve, of which the following is a full, clear, and exactdescription.

The object of the invention is to provide a new and improvedsafety-valve which is simple and durable in construction and veryeffective in operation, moving in a straight line when pressure isapplied.

The invention consists of a valve mounted to slide vertically, a pinbearing in the center of the valve, and a weighted lever pressing on thesaid pin.

The invention also consists of certain parts and details andcombinations of the same, as will be hereinafter fully described, andthen pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification,

in which similar letters of reference indicate i corresponding parts inboth the figures.

Figure l is a plan view of the improvement with parts in section, andFig. 2 is a sectional 1 side elevation of the same.

The improved safety-valve A is provided with the usual valve -body, B,in which is formed the valve-scat C, on the top of which is held thevalve-disk D, provided on its under side with down *ardly-extemlin gprojections E, fitting loosely in the opening of the alveseat, so as toguide the val ve-disk l) vertically when pressure is applied.

On top of thedisk D,in the center, is formed a cavit ll. in which reststhe lower rounded .V,

end, ;r, of a pin, G, extending vertically and provided at its upper endwith a point, G resting in a cone-shaped opening formed in the lower endof a set-screw, II, screwing in the valve-lever l, and secured in placein the said lever by a jam-nut, J.

The lever I fulcrumed on the pointed ends of the screws K and K,screwing in lugs L,

formed on the top of the cover N of the valvef hodyB. The pivotal centerof the levcrI is in horizontal line with the upper end of the pin G whenthe valve-disk D is closed, as is plainly shown in Fig. 2. For thispurpose the lever I has a recess, 1, directly below the screw H, so

l as to permit a free entrance of the upper end of the pin G. On thelever I is hung the usual weight, 0. On suitable standards formed on thecover X is secured a pin, P, held above the lever T to prevent thelatter from swinging too far upwardly.

The operation is as follows: lVh en the steam passing through thevalve-body B exceeds the normal pressure to which the weight 0 is set,then the steam forces the disk D upward off of its seat 0, whereby thesteam can pass from the compartment B to the compartment- 13 in thevalve body or casing B and out into the open air. This upward movementof the valve D lifts the pin G, which, by its pointed end G pressingagainst the screw H, raises the lever I. The lugs E on the disk-valve Dguide the latter in its vertical movement, and when the pressure in thecompartment B is reduced to the normal pressure the weighted i lever Iforces the valve D downward again on its seat (3. Thus it will be seenthat the movement of the valve I) is always vertical whether up or down,so that very little friction is produced and the valve becomes verysensitive. It will further be seen that the friction is still morereduced on account of the pin G being loosely connected with the valve Dand the lover I. As the latter is hung on points, as shown in Fig. 1,the friction of the lever in swinging is also reduced to a minimum. Itis understood that the valve D moves straight up and down, as the upperend of the pin G is in horizontal line with the pivot-point ot' thelover. The pin G passes loosely through an enlarged opening in the coverN, so that said pin forms contacts only at the top and 3 bottom, asbefore described. It will further be seen that the lever I can be placedin any direction after the valve-body secured in place-by turning thecover N accordingly and then fastening it to the valve-body.

IIavin g thus fully described my invention, 1 I claim as new and desireto secure by Letters Patent 1. In a safety-valve, the combination, with1 a weighted lever hung 011 pointed screws, of a set-screw screwing inthe said lever, a pin provided with a point at its upper end engagingthe under side of the said set-screw, and

a valve-disk mounted to slide vertically and gaging the upper pointedend of the said pin,

in the center of which rests the lower end of a lever in which screwssaid set-screw, and

the said pin, substantially as shown and descrews having pointed endsforming the pivot scribed. for the said lever, said screws screwing inlugs I 5 2. In a safety-valve, the combination, with on the said cover,substantially as shown and a valve-body provided with a valve-seat and adescribed.

cover secured 011 the said valve-body, of a valve provided with downwardproj eetions for E F. XAVIER VIEN. guiding itin its seat, a pin restingat its lower I Witnesses:

end in the center of the said valve and passing THEO. G. HOSTER,

loosely through said cover, a set-screw en- C. S/EDGVVICK.

